I made a topic on reddit about how to implement strategic intercontinental warfare right after the Hossin continent release, so that we don't have to wait another half year for battle islands to be finished. This is the plan and this is the reddit topic discussing it so feel free to give it a thumbs up (or thumps down if you disagree).
It involves concepts like this:
and this (details in the topic):
It involves concepts like this:
and this (details in the topic):